A few more clothing suggestions ... All are sold in transylvania (the incubus / succubus area) in a hidden shop in town (requires senses of 10 to find it - one of the closed areas is actually a shop maybe ?). No mechanical advantage despite the names - these are effectively costumes found in a hidden shop (the ship keeper could complain about the slow sales if talked to by running into them). Pumpkin set consists of a pumpkin helm, Pumpkin armor, Pumpkin Gloves & Pumpkin Boots and looks similar to the Pumpkin armor from terraria - orange pumpkin sections connected by green pumpkin vines. Reaper set consists of a long black robe with tattered edges that covers between the neck to the characters wrists and down to the characters ankles (loose fitting) and a black hood that also has tattered edges. Heroic Costume consists of a brightly contrasting color body suit that covers the same area as the reaper robe (but more skin tight) and brightly colored boots (think along the lines of the superman costume but not copyright infringing).
If you can point out exactly where the pumpkin set can be purchased I will edit that out from the suggestion but I have not seen anything like that in any of the clothing shops I have visited - as far as I can tell (from gameplay and the wiki), unless it can be found in the arc area that requires a pass (acquired via a quest line) to enter, the island area or locked behind the 'invincible' plant then I'm fairly certain its not in the game currently.
The general idea of the suggestion was some more costume themed clothing items if you want to dress you the character in something a little bit more whimsical then the generally practical or lewd options available in most stores.